#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>

int main() {
	int n;
	while (scanf("%d", &n) != EOF) {
		for (int i = 0; i < n; i++) {
			for (int j = 0; j < n; j++) {
				if (i == 0 || i == n - 1 || j == 0 || j == n - 1) {
					printf("* ");
				}
				else {
					printf("  ");
				}
			}
			printf("\n");
		}
	}
	return 0;
}